package com.quzi.kettle.datapiece;

import android.util.Log;

import com.quzi.kettle.datapiece.status.DeviceStatus;
import com.quzi.kettle.utils.ByteUtils;


public abstract class FactoryDataBody implements DataBodyDevInterface {

	public static int  REQUEST = 1;
	public static int RESPONSE = 2;
	
	// CRC8校验数据表 X^8 + X^5 + X^4 + 1
	public static int[] crc8_854_table = { 0, 94, 188, 226, 97, 63, 221, 131,
			194, 156, 126, 32, 163, 253, 31, 65, 157, 195, 33, 127, 252, 162,
			64, 30, 95, 1, 227, 189, 62, 96, 130, 220, 35, 125, 159, 193, 66,
			28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, 190, 224, 2, 92,
			223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, 70, 24, 250,
			164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, 219,
			133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
			101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152,
			122, 36, 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216,
			91, 5, 231, 185, 140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242,
			172, 47, 113, 147, 205, 17, 79, 173, 243, 112, 46, 204, 146, 211,
			141, 111, 49, 178, 236, 14, 80, 175, 241, 19, 77, 206, 144, 114,
			44, 109, 51, 209, 143, 12, 82, 176, 238, 50, 108, 142, 208, 83, 13,
			239, 177, 240, 174, 76, 18, 145, 207, 45, 115, 202, 148, 118, 40,
			171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, 87, 9, 235,
			181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, 233,
			183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246,
			168, 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215,
			137, 107, 53 };

	protected static byte getCRC(byte[] dataBuf, int dataLen) {
		int crc = 0;

		if (null == dataBuf || 0 == dataLen) {
			return (byte) crc;
		}

		byte[] tmp = dataBuf;
		int si = 0;
		for (si = 0; si < dataLen; si++) {
			if (tmp[si] > 256) {
				tmp[si] -= 256;
			}
			if ((crc ^ (tmp[si])) < 0) {
				tmp[si] += 128;
			}
			crc = crc8_854_table[crc ^ (tmp[si])];

		}
		return (byte) crc;
	}

	private static byte makeSum(byte[] bytes, int tmpLen) {
		byte resVal = 0;
		int si;
		for (si = 1; si < tmpLen; si++) {
			resVal = (byte) (resVal + bytes[si]);
		}
		//
		resVal = (byte) ((255 - (resVal % 256)) + 1);

		return resVal;

	}

	private byte[] AChead = new byte[] { (byte) 0x7F, 0x01, (byte) 0xEE, 0x00,
			(byte) 0xA1 };

	protected byte[] addHead(byte[] bytes) {

		byte[] result = new byte[bytes.length + AChead.length];// 最终数据
																// 长度为包头加协议体长度

		AChead[4] = (byte) (bytes.length + AChead.length - 1);// 数据长度
		System.arraycopy(AChead, 0, result, 0, AChead.length);
		System.arraycopy(bytes, 0, result, AChead.length, bytes.length);// 将
																			// Achead
																			// bytes内容放到result里
		result[result.length - 1] = makeSum(result.clone(), bytes.length
				+ AChead.length);
		
		
		return result;
	}

	public static FactoryDataBody createFactoryDataBody(int type, Object obj) {
		if (type == REQUEST) {
			return new DataBodyDevRequest((DeviceStatus) obj);
		} else {
			return new DataBodyDevResponse();
		}
	}

}
